What does our Mariner retainer have in common with a real mariner? Both were born to live aboard. The Mariner retainer is made from high-tenacity braided monofilament fishing line, making it ultra durable and element-proof. The grippy silicone ends stretch to fit most frames keeping them secure throughout long days on the water. Proudly made in the USA, the Mariner is a great choice for saltwater and freshwater adventures.